Smith n



No. 622,062. Patented Mar. 28, I899. S. N. MGGLUUD.

CHAIR.

(Application filed Aug. 19, 1898.

(No Model.)

IlNi'rnn STATES PATENT GFFICE.

SMITH N. MCCLOUD, OF MARYSVILLE, OHIO, ASSIGNOR TO THE DAVIS CHAIRCOMPANY, OF SAME PLACE.

CHAIR.

SPECIFICATION forming part of Letters Patent No. 622,062, dated March28, 1899.

Application filed August 19,1898. Serial No. 688,999. (No model.)

To (LZZ whom, it may concern:

Be it known that I, SMITH N. MOOLOUD, a

- resident of Marysville, in the county of Union and State of Ohio, haveinvented certain new and useful Improvements in Chairs; and I do herebydeclare the following to be a full, clear, and exact descriptionof theinvention, such as will enable others skilled in the art to which itpertains to make and use the same.

The invention relates to chairs having backs adapted to tilt, and moreparticularlyto those in which the back tilts independently of the seat;and its object is to increase the simplicity, efficiency, and economy ofthe spring tilting mechanism.

The invention consists in the construction hereinafter described andpointed out.

In the accompanying drawings, Figure 1 is a partial side elevationshowing the improvement applied. Fig. 2 is a bottom plan of the same.Fig. 3 is a rear elevation of a detail,

and Fig. 4 is an elevation of a modified detail.

Numeral 1 indicates a chair-seat, which may be of any desired style andconstruction.

2 denotes the seat or seat-frame support, which in the case illustratedhas four arms fixed to the seat by screws 3. It is by preference made ofiron, either cast or malleable.

4 denotes a screw-threaded socket at the junction orhub 5 of the'arms ofthe spiderframe 2, and 6 is a screw adapted to run in the socket. Thisscrew is fixed to the seat, which may be raised or lowered thereby inusual manner. The spider-arms are preferably strengthened by webs 7 andfinished, as indicated at 8, to receive the screws 3.

9 denotes a strong spring made of steel or other suitable .metal,preferably of wire, in one piece, which spring connects the backstandard10 to the seat-supporting spider 2. For this purpose each of.the twolimbs of the spring is coiled at 11 about a spider-arm, as shown, andextended backwardly in a curve to near the rear edge of the seat, wherethey are connected by a twist or coiling, as indicated at 12. The twolimbs of the spring are continued back of their junction 12 and upwardlytogether, forming a loop or extension 22. This rear extension 22 issituated in the forked foot or lower end of the back -supportingstandard, each limb being separately curved and disposed, as indicated,to receive a bolt at 14 and set-screw at15.

13 denotes a bolt or the like held in the bend 14 of the spring andstraddled by the standard-fork, being thereby adapted to support thestandard and back. This bolt not only forms a pivot for the backstandard or ening the set-screw 15 and tilting the hack on the bolt as apivot. When adjusted to the desired angle, the back is fixed bytightening the screw, the spring connection with the seat beingunaffected.

Obviously a set-screw might be used as the back-standard pivot and thepivot-bolt dispensed with, as indicated in Fig. l, but such constructionis not preferred. The tension I of this spring connection is madeadjustable by a screw engaging a bar 16, connected to the front ends ofthe spring near the outer end of the spider-arm opposite theback-standard. This bar receives the spring ends at 17.

18 denotes a set-screw passing through the bar 16 and bearing onthe headof a spiderfastening screw 3. The tension of the spring is varied bymanipulatingsaid screw 18.

Some of the advantages of the springsupport are independent ofparticular means of connecting the same to the standard.

The use of every desired material known to be suitable for the severalparts of the con struction is contemplated and also every desired styleof back or of seat.

I am aware that coiled springs have been combined with tilting seats andwith a tension-regulating screw, and such device is not herein claimed.

Having described my invention, I claim-- 1. The seat and back supportsand the spring comprising two members twisted together and formed into aloop whereby it is connected to the back-support, said back supporthaving a forked end to receive the loop,

and a set-screw to compress the fork members upon the loop,substantially as described.

2. The seat and back supporting standard and the spring comprising twomembers twisted together and formed into a loop whereby it is connectedto the back-support, said back-support having a forked end to receivethe loop, and a back-supporting pivot passing through the standard andloop, substantially as described.

3. The seat and back supporting standard and the spring comprising twomembers twisted together and formed into a loop whereby it is connectedto the back-support, said back-support having a forked end to receivethe loop, and a set screw to compress the fork members upon the loop,and a backsupporting pivot passing through the standard and loop,substantially as described.

4. In a chair,the seat,'the seat-support comprising a spider-frame, theback-support, the spring coiled about arms of the spider and having avertical rear portion fixed directly to the back-support andconstituting the sole connection between the seat and back, a bar toreceive the free front'ends of the spring, and means for operating saidbar to adjust the tension of the coils, substantially as described.

5. In a chair,the seat,the seat-support comprising a spider-frame, theback-support, a spring coiled about arms of the spider and having avertical rear portion fixed directly to the back-support andconstituting the sole connection between the seat and back, a bar toreceive the free front ends of the spring, and a set-screw passingthrough the bar and bearing on the seat to adjust the tension of thespring-coils, substantially as described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

SMITH N. MCCLOUD.

lVitnesses:

NELLE G. McCLoUD, L. PIPER.

